/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -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-d623d84 [2020-07-20 13:11:10,072 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 13:11:10,075 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 13:11:10,094 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 13:11:10,094 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:11:10,097 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:11:10,099 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:11:10,113 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:11:10,115 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:11:10,116 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:11:10,118 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:11:10,120 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:11:10,120 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:11:10,124 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:11:10,126 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:11:10,128 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:11:10,131 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:11:10,133 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:11:10,136 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:11:10,142 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:11:10,147 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:11:10,148 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:11:10,149 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:11:10,150 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:11:10,153 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 13:11:10,168 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:11:10,169 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:11:10,170 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:11:10,171 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 13:11:10,194 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:11:10,194 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:11:10,196 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:11:10,196 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:11:10,196 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:11:10,197 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:11:10,197 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:11:10,197 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:11:10,197 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:11:10,197 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:11:10,199 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:11:10,199 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:11:10,199 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:11:10,200 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:11:10,200 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:11:10,200 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:11:10,200 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:11:10,200 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:11:10,201 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:11:10,201 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:11:10,201 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:11:10,201 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:11:10,201 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:11:10,202 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:11:10,202 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:11:10,202 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:11:10,202 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:11:10,202 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:11:10,202 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:11:10,203 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 -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 13:11:10,474 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:11:10,488 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:11:10,491 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:11:10,493 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:11:10,494 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:11:10,494 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Fibonacci04.c [2020-07-20 13:11:10,571 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a17a5338a/b76283ac0e254dcaa9b6b785a6131220/FLAGa448aa6e2 [2020-07-20 13:11:11,011 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:11:11,011 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Fibonacci04.c [2020-07-20 13:11:11,016 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a17a5338a/b76283ac0e254dcaa9b6b785a6131220/FLAGa448aa6e2 [2020-07-20 13:11:11,395 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a17a5338a/b76283ac0e254dcaa9b6b785a6131220 [2020-07-20 13:11:11,405 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:11:11,408 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:11:11,409 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:11:11,409 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:11:11,413 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:11:11,414 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:11:11" (1/1) ... [2020-07-20 13:11:11,417 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6d1b18be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:11:11, skipping insertion in model container [2020-07-20 13:11:11,417 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:11:11" (1/1) ... [2020-07-20 13:11:11,427 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:11:11,448 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:11:11,642 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:11:11,649 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:11:11,669 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:11:11,681 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:11:11,681 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:11:11 WrapperNode [2020-07-20 13:11:11,681 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:11:11,682 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:11:11,682 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:11:11,683 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:11:11,694 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:11:11" (1/1) ... [2020-07-20 13:11:11,694 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:11:11" (1/1) ... [2020-07-20 13:11:11,699 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:11:11" (1/1) ... [2020-07-20 13:11:11,699 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:11:11" (1/1) ... [2020-07-20 13:11:11,704 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:11:11" (1/1) ... [2020-07-20 13:11:11,706 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:11:11" (1/1) ... [2020-07-20 13:11:11,707 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:11:11" (1/1) ... [2020-07-20 13:11:11,713 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:11:11,713 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:11:11,714 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:11:11,714 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:11:11,715 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:11:11" (1/1) ... No working directory specified, using /storage/repos/ultimate/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 [2020-07-20 13:11:11,866 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:11:11,866 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:11:11,866 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2020-07-20 13:11:11,867 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:11:11,867 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:11:11,867 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 13:11:11,868 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2020-07-20 13:11:11,868 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:11:11,868 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:11:11,868 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:11:12,043 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:11:12,043 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 13:11:12,046 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:11:12 BoogieIcfgContainer [2020-07-20 13:11:12,047 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:11:12,048 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:11:12,048 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:11:12,051 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:11:12,051 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:11:11" (1/3) ... [2020-07-20 13:11:12,052 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@321b73b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:11:12, skipping insertion in model container [2020-07-20 13:11:12,053 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:11:11" (2/3) ... [2020-07-20 13:11:12,053 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@321b73b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:11:12, skipping insertion in model container [2020-07-20 13:11:12,053 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:11:12" (3/3) ... [2020-07-20 13:11:12,055 INFO L109 eAbstractionObserver]: Analyzing ICFG Fibonacci04.c [2020-07-20 13:11:12,066 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:11:12,073 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:11:12,086 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:11:12,108 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:11:12,108 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:11:12,108 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:11:12,109 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:11:12,109 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:11:12,109 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:11:12,109 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:11:12,109 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:11:12,125 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-07-20 13:11:12,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 13:11:12,131 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:11:12,132 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:11:12,133 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:11:12,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:11:12,139 INFO L82 PathProgramCache]: Analyzing trace with hash -1356498376, now seen corresponding path program 1 times [2020-07-20 13:11:12,148 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:11:12,148 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1136097232] [2020-07-20 13:11:12,149 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:11:12,220 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:11:12,220 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:11:12,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:11:12,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:11:12,362 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:11:12,362 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:11:12,364 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1136097232] [2020-07-20 13:11:12,366 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:11:12,366 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:11:12,368 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386074439] [2020-07-20 13:11:12,374 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:11:12,374 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:11:12,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:11:12,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:11:12,410 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 5 states. [2020-07-20 13:11:12,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:11:12,517 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 13:11:12,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:11:12,520 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 13:11:12,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:11:12,531 INFO L225 Difference]: With dead ends: 35 [2020-07-20 13:11:12,531 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 13:11:12,535 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:11:12,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 13:11:12,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 13:11:12,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 13:11:12,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 13:11:12,584 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 13:11:12,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:11:12,585 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 13:11:12,585 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:11:12,585 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 13:11:12,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 13:11:12,588 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:11:12,588 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:11:12,803 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:11:12,803 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:11:12,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:11:12,804 INFO L82 PathProgramCache]: Analyzing trace with hash 1591396412, now seen corresponding path program 1 times [2020-07-20 13:11:12,805 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:11:12,806 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1722704160] [2020-07-20 13:11:12,806 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:11:12,840 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:11:12,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:11:12,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:11:12,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:11:12,872 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:11:12,872 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:11:12,873 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1722704160] [2020-07-20 13:11:12,873 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:11:12,873 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:11:12,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909615843] [2020-07-20 13:11:12,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:11:12,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:11:12,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:11:12,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:11:12,877 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 13:11:12,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:11:12,942 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 13:11:12,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:11:12,943 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 13:11:12,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:11:12,945 INFO L225 Difference]: With dead ends: 27 [2020-07-20 13:11:12,945 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 13:11:12,946 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:11:12,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 13:11:12,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 13:11:12,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 13:11:12,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 13:11:12,954 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 13:11:12,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:11:12,955 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 13:11:12,955 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:11:12,955 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 13:11:12,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 13:11:12,956 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:11:12,957 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] [2020-07-20 13:11:13,169 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:11:13,171 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:11:13,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:11:13,172 INFO L82 PathProgramCache]: Analyzing trace with hash -1761048597, now seen corresponding path program 1 times [2020-07-20 13:11:13,173 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:11:13,173 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [136939431] [2020-07-20 13:11:13,173 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:11:13,221 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:11:13,221 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:11:13,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:11:13,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:11:13,263 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 13:11:13,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:11:13,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:11:13,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:11:13,490 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 13:11:13,491 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [136939431] [2020-07-20 13:11:13,491 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:11:13,491 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 10 [2020-07-20 13:11:13,492 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562905247] [2020-07-20 13:11:13,492 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 13:11:13,492 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:11:13,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 13:11:13,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-07-20 13:11:13,493 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 10 states. [2020-07-20 13:11:13,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:11:13,622 INFO L93 Difference]: Finished difference Result 39 states and 57 transitions. [2020-07-20 13:11:13,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:11:13,623 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 13:11:13,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:11:13,625 INFO L225 Difference]: With dead ends: 39 [2020-07-20 13:11:13,626 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 13:11:13,626 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-07-20 13:11:13,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 13:11:13,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2020-07-20 13:11:13,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 13:11:13,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 13:11:13,638 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 26 [2020-07-20 13:11:13,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:11:13,639 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 13:11:13,639 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 13:11:13,639 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 13:11:13,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-20 13:11:13,643 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:11:13,643 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:11:13,854 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:11:13,854 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:11:13,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:11:13,855 INFO L82 PathProgramCache]: Analyzing trace with hash -801998671, now seen corresponding path program 1 times [2020-07-20 13:11:13,856 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:11:13,856 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [567735036] [2020-07-20 13:11:13,857 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:11:13,895 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:11:13,896 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:11:13,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:11:13,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:11:13,951 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 11 proven. 48 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2020-07-20 13:11:13,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:11:14,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:11:14,278 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:11:14,350 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:11:14,400 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 11 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 13:11:14,401 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [567735036] [2020-07-20 13:11:14,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:11:14,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 12 [2020-07-20 13:11:14,402 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699510275] [2020-07-20 13:11:14,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 13:11:14,403 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:11:14,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 13:11:14,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:11:14,403 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 12 states. [2020-07-20 13:11:14,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:11:14,579 INFO L93 Difference]: Finished difference Result 57 states and 114 transitions. [2020-07-20 13:11:14,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:11:14,580 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 54 [2020-07-20 13:11:14,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:11:14,584 INFO L225 Difference]: With dead ends: 57 [2020-07-20 13:11:14,585 INFO L226 Difference]: Without dead ends: 51 [2020-07-20 13:11:14,586 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 92 SyntacticMatches, 5 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2020-07-20 13:11:14,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-07-20 13:11:14,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 36. [2020-07-20 13:11:14,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 13:11:14,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 13:11:14,603 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 54 [2020-07-20 13:11:14,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:11:14,604 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 13:11:14,604 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 13:11:14,605 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 13:11:14,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 13:11:14,611 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:11:14,611 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:11:14,812 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:11:14,813 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:11:14,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:11:14,814 INFO L82 PathProgramCache]: Analyzing trace with hash -1550748140, now seen corresponding path program 2 times [2020-07-20 13:11:14,814 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:11:14,815 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1310861808] [2020-07-20 13:11:14,815 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:11:14,893 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:11:14,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:11:14,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:11:14,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:11:14,998 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-20 13:11:14,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:11:15,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:11:15,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:11:15,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:11:15,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:11:15,980 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:11:15,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:11:16,030 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 13:11:16,030 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1310861808] [2020-07-20 13:11:16,031 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:11:16,031 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-20 13:11:16,031 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1055781070] [2020-07-20 13:11:16,032 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 13:11:16,032 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:11:16,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 13:11:16,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:11:16,033 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 14 states. [2020-07-20 13:11:16,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:11:16,246 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-20 13:11:16,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:11:16,248 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 117 [2020-07-20 13:11:16,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:11:16,253 INFO L225 Difference]: With dead ends: 62 [2020-07-20 13:11:16,253 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 13:11:16,258 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:11:16,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 13:11:16,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-20 13:11:16,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 13:11:16,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 13:11:16,283 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-20 13:11:16,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:11:16,284 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 13:11:16,284 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 13:11:16,284 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 13:11:16,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2020-07-20 13:11:16,288 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:11:16,288 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] [2020-07-20 13:11:16,501 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:11:16,502 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:11:16,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:11:16,503 INFO L82 PathProgramCache]: Analyzing trace with hash 1110256604, now seen corresponding path program 2 times [2020-07-20 13:11:16,503 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:11:16,504 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [714104460] [2020-07-20 13:11:16,504 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:11:16,592 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:11:16,592 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:11:16,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:11:16,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:11:16,703 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 327 proven. 131 refuted. 0 times theorem prover too weak. 698 trivial. 0 not checked. [2020-07-20 13:11:16,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:11:17,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:11:17,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:11:17,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:11:17,663 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:11:17,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:11:17,809 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 327 proven. 153 refuted. 0 times theorem prover too weak. 676 trivial. 0 not checked. [2020-07-20 13:11:17,809 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [714104460] [2020-07-20 13:11:17,810 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:11:17,810 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-20 13:11:17,810 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812415224] [2020-07-20 13:11:17,811 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 13:11:17,811 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:11:17,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 13:11:17,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:11:17,812 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 14 states. [2020-07-20 13:11:18,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:11:18,064 INFO L93 Difference]: Finished difference Result 87 states and 265 transitions. [2020-07-20 13:11:18,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:11:18,065 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 150 [2020-07-20 13:11:18,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:11:18,069 INFO L225 Difference]: With dead ends: 87 [2020-07-20 13:11:18,069 INFO L226 Difference]: Without dead ends: 60 [2020-07-20 13:11:18,073 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 276 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:11:18,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-20 13:11:18,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-20 13:11:18,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 13:11:18,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 104 transitions. [2020-07-20 13:11:18,087 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 104 transitions. Word has length 150 [2020-07-20 13:11:18,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:11:18,088 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 104 transitions. [2020-07-20 13:11:18,089 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 13:11:18,089 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 104 transitions. [2020-07-20 13:11:18,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 13:11:18,102 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:11:18,102 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] [2020-07-20 13:11:18,312 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:11:18,313 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:11:18,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:11:18,313 INFO L82 PathProgramCache]: Analyzing trace with hash 580129251, now seen corresponding path program 3 times [2020-07-20 13:11:18,313 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:11:18,314 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [400036163] [2020-07-20 13:11:18,314 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:11:18,400 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:11:18,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 13:11:18,400 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 13:11:18,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 13:11:18,428 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 13:11:18,462 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 13:11:18,463 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 13:11:18,677 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:11:18,718 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 01:11:18 BoogieIcfgContainer [2020-07-20 13:11:18,718 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 13:11:18,721 INFO L168 Benchmark]: Toolchain (without parser) took 7313.59 ms. Allocated memory was 140.0 MB in the beginning and 290.5 MB in the end (delta: 150.5 MB). Free memory was 103.7 MB in the beginning and 249.2 MB in the end (delta: -145.4 MB). Peak memory consumption was 5.0 MB. Max. memory is 7.1 GB. [2020-07-20 13:11:18,721 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 140.0 MB. Free memory is still 121.4 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-20 13:11:18,722 INFO L168 Benchmark]: CACSL2BoogieTranslator took 273.05 ms. Allocated memory is still 140.0 MB. Free memory was 103.3 MB in the beginning and 93.8 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-07-20 13:11:18,723 INFO L168 Benchmark]: Boogie Preprocessor took 30.85 ms. Allocated memory is still 140.0 MB. Free memory was 93.8 MB in the beginning and 92.5 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-20 13:11:18,724 INFO L168 Benchmark]: RCFGBuilder took 333.31 ms. Allocated memory was 140.0 MB in the beginning and 204.5 MB in the end (delta: 64.5 MB). Free memory was 92.5 MB in the beginning and 171.8 MB in the end (delta: -79.3 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. [2020-07-20 13:11:18,725 INFO L168 Benchmark]: TraceAbstraction took 6670.51 ms. Allocated memory was 204.5 MB in the beginning and 290.5 MB in the end (delta: 86.0 MB). Free memory was 171.8 MB in the beginning and 249.2 MB in the end (delta: -77.3 MB). Peak memory consumption was 8.7 MB. Max. memory is 7.1 GB. [2020-07-20 13:11:18,729 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 140.0 MB. Free memory is still 121.4 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 273.05 ms. Allocated memory is still 140.0 MB. Free memory was 103.3 MB in the beginning and 93.8 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 30.85 ms. Allocated memory is still 140.0 MB. Free memory was 93.8 MB in the beginning and 92.5 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 333.31 ms. Allocated memory was 140.0 MB in the beginning and 204.5 MB in the end (delta: 64.5 MB). Free memory was 92.5 MB in the beginning and 171.8 MB in the end (delta: -79.3 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6670.51 ms. Allocated memory was 204.5 MB in the beginning and 290.5 MB in the end (delta: 86.0 MB). Free memory was 171.8 MB in the beginning and 249.2 MB in the end (delta: -77.3 MB). Peak memory consumption was 8.7 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) VAL [\old(n)=5] [L17] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L19] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=4] [L17] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L19] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=3] [L17] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L19] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=2] [L17] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L19] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L17] COND TRUE n < 1 [L18] return 0; VAL [\old(n)=0, \result=0, n=0] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=3, fibonacci(n-1)=1, n=3] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=3, fibonacci(n-1)=1, fibonacci(n-2)=1, n=3] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=4, fibonacci(n-1)=2, n=4] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=2] [L17] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L19] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L17] COND TRUE n < 1 [L18] return 0; VAL [\old(n)=0, \result=0, n=0] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=4, fibonacci(n-1)=2, fibonacci(n-2)=1, n=4] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=5, fibonacci(n-1)=3, n=5] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=3] [L17] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L19] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=2] [L17] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L19] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L17] COND TRUE n < 1 [L18] return 0; VAL [\old(n)=0, \result=0, n=0] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=3, fibonacci(n-1)=1, n=3] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=3, fibonacci(n-1)=1, fibonacci(n-2)=1, n=3] [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=5, fibonacci(n-1)=3, fibonacci(n-2)=2, n=5] [L22] return fibonacci(n-1) + fibonacci(n-2); [L29] RET, EXPR fibonacci(x) VAL [fibonacci(x)=5, x=5] [L29] int result = fibonacci(x); [L30] COND FALSE !(x != 5 || result == 3) VAL [result=5, x=5] [L33] __VERIFIER_error() VAL [result=5, x=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 23 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 6.5s, OverallIterations: 7, TraceHistogramMax: 21, AutomataDifference: 1.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 106 SDtfs, 106 SDslu, 339 SDs, 0 SdLazy, 405 SolverSat, 130 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 737 GetRequests, 640 SyntacticMatches, 30 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 0.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=60occurred in iteration=6, 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, 6 MinimizatonAttempts, 36 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 3.3s InterpolantComputationTime, 483 NumberOfCodeBlocks, 436 NumberOfCodeBlocksAsserted, 23 NumberOfCheckSat, 711 ConstructedInterpolants, 0 QuantifiedInterpolants, 144003 SizeOfPredicates, 27 NumberOfNonLiveVariables, 789 ConjunctsInSsa, 46 ConjunctsInUnsatCore, 10 InterpolantComputations, 2 PerfectInterpolantSequences, 3006/3916 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...