/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 BIGGEST_EQUIVALENCE_CLASS --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-simple/fibo_2calls_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 00:46:05,266 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 00:46:05,327 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 00:46:05,331 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 00:46:05,334 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 00:46:05,336 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 00:46:05,337 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 00:46:05,339 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 00:46:05,341 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 00:46:05,347 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 00:46:05,352 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 00:46:05,354 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 00:46:05,359 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 00:46:05,360 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 00:46:05,364 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 00:46:05,388 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 [2020-07-21 00:46:05,433 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 00:46:05,434 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 00:46:05,435 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 00:46:05,435 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 00:46:05,435 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 00:46:05,436 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 00:46:05,436 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 00:46:05,439 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 00:46:05,440 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 00:46:05,440 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 00:46:05,440 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 00:46:05,440 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 00:46:05,440 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 00:46:05,441 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 00:46:05,441 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 00:46:05,441 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 00:46:05,443 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 00:46:05,443 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 00:46:05,443 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 00:46:05,444 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 00:46:05,444 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 00:46:05,444 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 00:46:05,444 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 00:46:05,444 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 00:46:05,445 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 00:46:05,445 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 00:46:05,445 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:46:05,445 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 00:46:05,445 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 00:46:05,445 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 -> BIGGEST_EQUIVALENCE_CLASS 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 [2020-07-21 00:46:05,806 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 00:46:05,831 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 00:46:05,836 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 00:46:05,838 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 00:46:05,838 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 00:46:05,839 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c [2020-07-21 00:46:05,941 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/53e1103aa/a7d19ba91c6e466aaa4434430557460d/FLAGbbef8268d [2020-07-21 00:46:06,472 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 00:46:06,473 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c [2020-07-21 00:46:06,479 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/53e1103aa/a7d19ba91c6e466aaa4434430557460d/FLAGbbef8268d [2020-07-21 00:46:06,833 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/53e1103aa/a7d19ba91c6e466aaa4434430557460d [2020-07-21 00:46:06,845 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 00:46:06,848 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 00:46:06,849 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 00:46:06,849 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 00:46:06,854 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 00:46:06,855 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:46:06" (1/1) ... [2020-07-21 00:46:06,860 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2a72cadb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:46:06, skipping insertion in model container [2020-07-21 00:46:06,860 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:46:06" (1/1) ... [2020-07-21 00:46:06,871 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 00:46:06,894 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 00:46:07,097 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:46:07,103 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 00:46:07,124 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:46:07,142 INFO L208 MainTranslator]: Completed translation [2020-07-21 00:46:07,142 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:46:07 WrapperNode [2020-07-21 00:46:07,143 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 00:46:07,144 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 00:46:07,144 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 00:46:07,144 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 00:46:07,161 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:46:07" (1/1) ... [2020-07-21 00:46:07,162 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:46:07" (1/1) ... [2020-07-21 00:46:07,169 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:46:07" (1/1) ... [2020-07-21 00:46:07,169 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:46:07" (1/1) ... [2020-07-21 00:46:07,174 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:46:07" (1/1) ... [2020-07-21 00:46:07,177 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:46:07" (1/1) ... [2020-07-21 00:46:07,178 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:46:07" (1/1) ... [2020-07-21 00:46:07,180 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 00:46:07,180 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 00:46:07,181 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 00:46:07,181 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 00:46:07,182 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:46:07" (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 [2020-07-21 00:46:07,347 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 00:46:07,347 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 00:46:07,348 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 00:46:07,348 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 00:46:07,348 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 00:46:07,348 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 00:46:07,348 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 00:46:07,348 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 00:46:07,349 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 00:46:07,349 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 00:46:07,349 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 00:46:07,349 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 00:46:07,573 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 00:46:07,573 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 00:46:07,578 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:46:07 BoogieIcfgContainer [2020-07-21 00:46:07,579 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 00:46:07,580 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 00:46:07,580 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 00:46:07,584 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 00:46:07,585 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 12:46:06" (1/3) ... [2020-07-21 00:46:07,590 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1123367a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:46:07, skipping insertion in model container [2020-07-21 00:46:07,591 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:46:07" (2/3) ... [2020-07-21 00:46:07,591 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1123367a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:46:07, skipping insertion in model container [2020-07-21 00:46:07,592 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:46:07" (3/3) ... [2020-07-21 00:46:07,594 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_2-1.c [2020-07-21 00:46:07,608 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 00:46:07,619 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 00:46:07,636 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 00:46:07,674 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 00:46:07,675 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 00:46:07,675 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 00:46:07,676 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 00:46:07,676 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 00:46:07,676 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 00:46:07,677 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 00:46:07,677 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 00:46:07,707 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 00:46:07,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 00:46:07,718 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:46:07,720 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:46:07,721 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:46:07,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:46:07,731 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 00:46:07,745 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:46:07,745 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [23799042] [2020-07-21 00:46:07,746 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 [2020-07-21 00:46:07,827 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:46:07,827 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:46:07,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 00:46:07,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:46:07,943 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 00:46:07,943 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:46:07,945 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [23799042] [2020-07-21 00:46:07,946 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:46:07,946 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:46:07,948 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360857987] [2020-07-21 00:46:07,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:46:07,956 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:46:07,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:46:07,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:46:07,972 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 00:46:08,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:46:08,112 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 00:46:08,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:46:08,115 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 00:46:08,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:46:08,127 INFO L225 Difference]: With dead ends: 44 [2020-07-21 00:46:08,127 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 00:46:08,132 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 [2020-07-21 00:46:08,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 00:46:08,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 00:46:08,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 00:46:08,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 00:46:08,194 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 00:46:08,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:46:08,195 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 00:46:08,195 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:46:08,195 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 00:46:08,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 00:46:08,198 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:46:08,198 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:46:08,412 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:46:08,413 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:46:08,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:46:08,414 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 00:46:08,415 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:46:08,415 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [463094533] [2020-07-21 00:46:08,416 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 [2020-07-21 00:46:08,447 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:46:08,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:46:08,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 00:46:08,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:46:08,493 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 00:46:08,494 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:46:08,494 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [463094533] [2020-07-21 00:46:08,495 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:46:08,495 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:46:08,495 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161976719] [2020-07-21 00:46:08,497 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:46:08,498 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:46:08,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:46:08,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:46:08,499 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 00:46:08,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:46:08,582 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 00:46:08,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:46:08,583 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 00:46:08,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:46:08,585 INFO L225 Difference]: With dead ends: 36 [2020-07-21 00:46:08,586 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 00:46:08,587 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 [2020-07-21 00:46:08,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 00:46:08,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 00:46:08,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 00:46:08,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 00:46:08,599 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 00:46:08,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:46:08,600 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 00:46:08,600 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:46:08,602 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 00:46:08,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 00:46:08,604 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:46:08,604 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:46:08,818 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:46:08,819 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:46:08,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:46:08,820 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 00:46:08,821 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:46:08,821 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2123109827] [2020-07-21 00:46:08,822 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 [2020-07-21 00:46:08,855 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:46:08,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:46:08,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 00:46:08,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:46:08,964 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 00:46:08,964 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:46:09,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:09,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:46:09,293 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 00:46:09,294 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2123109827] [2020-07-21 00:46:09,294 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:46:09,294 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-21 00:46:09,295 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758916231] [2020-07-21 00:46:09,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 00:46:09,296 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:46:09,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 00:46:09,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-21 00:46:09,297 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 9 states. [2020-07-21 00:46:09,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:46:09,433 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 00:46:09,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 00:46:09,435 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 00:46:09,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:46:09,437 INFO L225 Difference]: With dead ends: 41 [2020-07-21 00:46:09,437 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 00:46:09,438 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 5 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:46:09,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 00:46:09,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 00:46:09,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 00:46:09,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 00:46:09,452 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 00:46:09,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:46:09,452 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 00:46:09,452 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 00:46:09,453 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 00:46:09,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 00:46:09,454 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:46:09,455 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:46:09,667 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:46:09,668 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:46:09,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:46:09,668 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 00:46:09,669 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:46:09,669 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1229095897] [2020-07-21 00:46:09,669 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 [2020-07-21 00:46:09,706 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 00:46:09,706 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 00:46:09,707 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 00:46:09,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 00:46:09,719 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 00:46:09,736 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 00:46:09,737 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 00:46:09,951 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:46:09,979 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 12:46:09 BoogieIcfgContainer [2020-07-21 00:46:09,979 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 00:46:09,983 INFO L168 Benchmark]: Toolchain (without parser) took 3134.67 ms. Allocated memory was 146.3 MB in the beginning and 233.3 MB in the end (delta: 87.0 MB). Free memory was 103.3 MB in the beginning and 178.9 MB in the end (delta: -75.6 MB). Peak memory consumption was 11.4 MB. Max. memory is 7.1 GB. [2020-07-21 00:46:09,984 INFO L168 Benchmark]: CDTParser took 0.37 ms. Allocated memory is still 146.3 MB. Free memory is still 120.8 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-21 00:46:09,985 INFO L168 Benchmark]: CACSL2BoogieTranslator took 294.07 ms. Allocated memory is still 146.3 MB. Free memory was 102.9 MB in the beginning and 93.3 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-07-21 00:46:09,986 INFO L168 Benchmark]: Boogie Preprocessor took 36.35 ms. Allocated memory is still 146.3 MB. Free memory was 93.3 MB in the beginning and 91.6 MB in the end (delta: 1.7 MB). Peak memory consumption was 1.7 MB. Max. memory is 7.1 GB. [2020-07-21 00:46:09,987 INFO L168 Benchmark]: RCFGBuilder took 398.56 ms. Allocated memory was 146.3 MB in the beginning and 203.4 MB in the end (delta: 57.1 MB). Free memory was 91.6 MB in the beginning and 170.3 MB in the end (delta: -78.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-21 00:46:09,988 INFO L168 Benchmark]: TraceAbstraction took 2399.25 ms. Allocated memory was 203.4 MB in the beginning and 233.3 MB in the end (delta: 29.9 MB). Free memory was 169.3 MB in the beginning and 178.9 MB in the end (delta: -9.6 MB). Peak memory consumption was 20.3 MB. Max. memory is 7.1 GB. [2020-07-21 00:46:09,992 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.37 ms. Allocated memory is still 146.3 MB. Free memory is still 120.8 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 294.07 ms. Allocated memory is still 146.3 MB. Free memory was 102.9 MB in the beginning and 93.3 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 36.35 ms. Allocated memory is still 146.3 MB. Free memory was 93.3 MB in the beginning and 91.6 MB in the end (delta: 1.7 MB). Peak memory consumption was 1.7 MB. Max. memory is 7.1 GB. * RCFGBuilder took 398.56 ms. Allocated memory was 146.3 MB in the beginning and 203.4 MB in the end (delta: 57.1 MB). Free memory was 91.6 MB in the beginning and 170.3 MB in the end (delta: -78.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2399.25 ms. Allocated memory was 203.4 MB in the beginning and 233.3 MB in the end (delta: 29.9 MB). Free memory was 169.3 MB in the beginning and 178.9 MB in the end (delta: -9.6 MB). Peak memory consumption was 20.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 2; VAL [x=2] [L37] CALL, EXPR fibo1(x) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) VAL [fibo1(x)=1, x=2] [L37] int result = fibo1(x); [L38] COND TRUE result == 1 VAL [result=1, x=2] [L39] __VERIFIER_error() VAL [result=1, x=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.2s, OverallIterations: 4, TraceHistogramMax: 2, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 80 SDtfs, 51 SDslu, 203 SDs, 0 SdLazy, 129 SolverSat, 11 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 80 GetRequests, 58 SyntacticMatches, 5 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=35occurred in iteration=3, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 3 MinimizatonAttempts, 4 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 80 NumberOfCodeBlocks, 61 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 75 ConstructedInterpolants, 0 QuantifiedInterpolants, 3389 SizeOfPredicates, 7 NumberOfNonLiveVariables, 83 ConjunctsInSsa, 14 ConjunctsInUnsatCore, 4 InterpolantComputations, 2 PerfectInterpolantSequences, 2/8 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...